Valve for hot-blast furnaces.



P. L. KEISER VALVE HOT BLAST FURNAGES. APPLICATION FILED DBo.1e, 1912.

1,070,693., vPawenteumug.19,1913.

2 SHEETS-SHEET 1.

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*Inman P. L. KEISBR.

VALVE POR HOT BLAST PURNACBS.

APPLIoATIoN ULEB 1320.18, 1912.

Lwmg., Patented Aug. 19,1913.

2 SHEBTS-SHEBT 2.

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` Efrlm Eg u ventot- @l Hoz 11213 unan stairs Para " T @tlFlFllQE PAUL L. KEIsEER, oFro'rTs'roWN, rrusrnvama.r

VALVE FOR HOT-BLAST FURNACYS.

Specification of Letters Patent.

Patenten aug. ia, isis.

Application filed December 18, 1912. Serial No. 737,448.

To aM whom t may concern:

Be it known that I, PAUL L. KEISER, a citizen of the United States, residing at Pottstown, in the4 county of Montgomery type, and a seat therefor, and it consists of the parts and4 combinations of parts hereinafter described and claimed.

- In the accompanying drawings forming a part of this specification, Figure 1 is a Ver- Vtical section through a valve chamber or casing showing my improved valve in position for operation.' Fig. 2 is a vertical section' through my improved valve showing the parts or sections comprising th'e same separated and in position to be joined and welded together. Fig. 3 is as-imilar view showing the sectionswelded together. Fig. l is a detail sectional view showing amodiiication of the form of the meeting edges of welding. Figs. 5, 6, 7, 8 and 9, are detail views showing modified means for securing the halves or sections of theV valve together. Fig. 10 is a plan view of the valve seat showing one half thereof in horizontal section. Fig. 11 is a transverse vertical section through the valve seat. Figs. 12,-13, '14 and l5 are' detail sectional views showing modi- .ied forms of the valveseat.

Similar letters refer to'v similar parts throughout all the views.

`Valves of the typel under consideration, commonly known as mushroom valves, now in use are made in cast iron and in cast steel and bronze which are, so far as l am informed, the lonly metals now employed for vthe purpose. This is also true of the valve seats. With these metals it has beenl found impossible to hold 'the cores in place suffito cool the thicker' portions of the valve and its Seat than the thinner. This results in uneven expansion and contraction in 'fthe metal which causesl it to crack and thus render the parts useless.` l obviate the objectionable feature noted to valves and valve seats of this class and provide a valve and seat adapted to withstand lthe strains to which they are subjected to by reason of the great variance in the temperature of the air passing over the same, which variance ranges within avery few minutes from a temperature of 200 F. to '1600 F., by stamping or pressing the parts from sheet steel. Preferably thevalve' is formed in two parts, and welded or otherwise rigidlysecuredtogether to form the valve, thereby providing a valve of uniform thickness, great strength, durability, and.. of less weight than valves made in cast metal, and which may be uniformly or evenly cooled in alL its parts and thereby avoiding the liability to uneven eX- pansion and contraction of the metal due to uneven cooling which causes the metal to crack. So also the valve seats are'pressed, stamped or flanged to shape from steel plates.

Referring tothe drawings A represents the usual valve chamber of a hot-blast valve, C the cap of the valve chamber, and D the 'stuiling boX in said, cap through which the `hollow valve-stern E passes. The valve-stem is cbnnected with any suitable means (not shown) by which it may bemoved vertically, s`o as to seat and unseat the valv.e.

F is the usual pipe which extends through the valve-stem down 'into' the hollow valve7 and through which the water flows to the hollow valve from a waterv supply pipe G, and, after circulating through the valve,

passes up through` the valve-stem and es-` capes through an outlet pipe H at the upper end of the same. i

The parts just described may be of the `usual or any desired type and form no part of my present linvention which relates solely to the valve and its seat.

Referring particularly to Figs. 2 and 3 of the drawings, a designates the upper half or 'section and b the lower half or section of a hollow valve B, both of said sections being concave-convex in shape and the upper section, a, being formed with the central neck e, to which the stem is welded, thus making the metal continuous. The halves or sect-ions of the valve are formed from sheet stcel'and are pressed or stamped to the shape shown and then brought together and their meetingV edges welded, by electricity. or otherwise, to form the valve as shown in Figs. 1 and 3.

. In Fig. 1 is shown a modification in which thc edge of the upper half or section, a, is provided' with a lip .e which extends across the joint when the sections arebrought together, the purpose of which being to prevent the metal running down during the welding operationf and thereby causing an uneven thickness in the shell inaccessible to be dressed.

In Fig. 5 is shown a modified form of joining the sections or halves in which the joint is shown as a plain butt joint with a riorly threaded, as at n, and the sections lapped and screwed together and held against movement by patch bolts 0.

In Fig. 8 is shown` a modification wherein a threaded halving lap-joint p is employed to secure the sections together with a patch bolt r to prevent movement, while in Fig. 9 a plain -lap-joint is employed and patch bolts used to secure the sections together, but the sections are not threaded.

It will be understood that in all the modifications showing the connection of the sections other than by welding that all the joints are made water tight by calking.

The nature and shape of the valve seat castings for valves of the type described are such that'it is extremely difficult to obtain perfectly solid metal in these products. Blow holes, pittings, and honeycombing are very common and sometimes impossible to detect before the valve'seat is in position and subjected to extreme external heat with a Water pressure inside under which condi- -tions the small holes in' the castings open and permit of the introduction of moisture into the air passing over the parts which is thereby carried into the furnace.

To obviate the objections noted'above' and produce a valve seat of uniform thickness throughout as well as one that is perfectly air and water tight under all the conditions to which it may be subjected I flange the seats to shape from rolled steel plates. The shape given the body of the seat may be varied with equally good results and Ilhave illustrated several formsl thereof. -rlhus in Figs. 10 and 11 is shown a seat the main portion of which is ianged from one piece and in which (Z represents the seat, proper, dyan inner annular partition or ring forming, with the nose of the seat, the Water chamber d2, and d? a perforated outer ring which permitsair cooling and also serves to hold the top and bottom of the seat properly spaced apart. In this instance the body or-main portion of .the seat consists of a single sheet or piece bent, by Hanging,

to shape, and the rings (Z1, d3 are held in place by rivets d4 connecting the top and bottom and pinching the lsame on' the rings.

A partition d5 is arranged transverse the v water chamber d2 between the inlet opening d6 and outlet opening Z7 .in order to prevent short circuiting of the water from the inlet to the outlet openings. A pipe Z8 from any convenient source of supply is connected to the opening d to supply the water and a pipe dg is connected to the opening d? for the discharge of the same.

In Fig. 12 is .shown a seat having a sharper nose e1 than a flanged piece g1 and a flat piece g2, the,

-weld being made at each'side, as at g3. In

Fig. 15 is shown a seat, 72,1 formed from 'a single piece of material fianged so that its edges meet at one corner, at which point, 7a2, the joint is welded. All of the shapes or forms shown are designed to be water cooled by thecirculation of water therethrough in a manner similar to that shown in Fig. 10, vand instead of using rivets as shown in Figs. 10, 11 and 12 toI hold the top and bottom of the seats in pinching contact with the :rings shown therein, said rings may be welded in place. Y

While I have shown and described a number of methods whereby the sections may be rigidly joined in water tight connection, I-y

do not desire to be confined to any particular method of so joining, as it is obvious that other means may be employed for a like purp'se without departing from the scope of my, invention.

What I claim is: 1. A hot-blast valve, comprising an upper and lowersection'each pressed to a concavoconvex shape in sheet metal, and rigidly joined together to form a hollow valve.

' 2. A hot-blast valve, comprising two sections each pressed to a concavo-convex shape in sheet metal, and rigidly joined together to form a hollow valve anclone of said sections having an integral neck.

3.'4 A hot-blast valve, comprising an upper and lower section each pressed to a. concaveconvex shape sheet metal, and welded together-to form a hollow valve, and one of sind sections having anintegral neck.

4. A hot blast valve seat, consisting of a. circular hollow structure adapted to be water cooled, the parts of said structure being pressed or flanged to shape from sheet metal and rigidly joined together.

5. A .hollow hot blast valve, comprising an upper and lower section rigidly secured together, one of said sections being lpressed to a concavo-convex form to adapt it to fit a valve seat.

6. A hollow hot blast valve, comprising an upper and lower section rigidly secured together, lone of said sections being adapted to fit a valve seat, and the other having an integral stem. l 20 "In, testimony iwhereof, l ax my signa.-

ture, in the presence of two witnesses.

v PAUL L. KESER. Witnesses: v

` 'GEo.lE-l. BAER,

GEO. ZOELLER. 

